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Windows 7: May have gotten infected on flash drive insertion, would enjoy help.

Hello, I've been letting my brother use my fairly old laptop for a while (doubt it's related), and recently got it back. When I put in my flash drive to transfer some files, there was only a shortcut seemingly redirecting to the drive itself. After clicking and waiting for a while, avast popped up, though it didn't quarantine it or anything. After googling, I'm kinda worried it already infected things in my computer, what should I do to be sure?
Here's a screenshot of the message https://gyazo.com/e9d38d51f5f2e4fd5f96079f11be123b

On a side-note, maybe a thorough clean up would be nice too; svchost (netsvscs) has been taking a lot of memory on startups and on waking up my computer for a while.

The flash drive getting infected strikes me as very strange since I've more or less only used it on university computers, recently.

May have gotten infected on flash drive insertion, would enjoy help.

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